Improvement in wrenches



ilnltml gisten parte een.

ANDREW R.' LIPSRY,

or NRW` YORK, N. Y.

Letters Patent No. 98,698, dated-Tannen; 11,1870.

IMPROVEMENT IN WRENCHE'S.

The Schedule referred to in `these Letters Patent and making part of the same.

To all whom it lmay concern: I

Be't known that I, ANDREW B. LIRSRY, of the city, county, and State of New York, have invented certain new and useful Improvements in Vr'enches; and I do hereby declare that the following is a full,

. clear, and exact description thereof, reference heilig sliding jaw being moved or,operated yby a screw-bolt.

My said invention consists in the application to sucha wrench, in the manner hereinafter set forth, of a Iscrew-holt, having a right-hand screw-.thread at one part, and a left-hand screw-thread at another pal't, one of which threads works in a nut or female screw, formed on or in a portion of the, said shank, and the other end works in a female screw formed in the sliding jaw. i

It also consists in extending one end of the bolt or screw, in the form of a plain pin, through a hole in the i'errule at the inner end of the handle, to give additional strength and stifness to the working parts. By this arrangement of the parts, the sliding jaw is, by any given number of turns of the screw-bolt, moved twice as far as by the bolt having a single thread ot' the same pitch and angle.

There is no tendency ofthe holt to turn or back out under prcssure,.no matter how great the angle of the threadsmay be. .These qualities make it very easy and rapid of adjustment, and very firm and rigid, when adjusted to grasp any object within its capacity.,

In Vthe accompanying drawings- Figure 1 is a sideelevation ofa wrench embodying my invention.

Figure 2 is an edge or front view of the same.

Figure 3 is a side elevation, in detail, of the screw or bolt, on a scale twice as large as thatof igs. l and 2.

A is the jaw, rigidly fixed to Ithe shank or extensioii-bar B, and

C is the sliding jaw.

E is the screw-bolt; and

F, the wrench-handle.

The shank has, at the end adjacent to the jaw A, an enlarged or projecting portion, a, formed upon it. A hole is made in this enlargement, and the nut or female screw is formed in it, to receive one end of the bolt E. The nut for the other portion of the bolt E,

is formed in the sliding jaw O, which has a slot in it large enough at one end to admit the enlarged portion a ofthe shank, and to allow it to enter the' jaw until it comes in contact with the nut, shown in dotted lines at b, 'at the moment the jaws come together'.

The shank extends through the handle, and is secured by a conical nut, c, which is screwed up against a washer, d.

The ferrule e has two holes in it, one for the shank and handle, and the other for the pin f to pass through.

The former is made square at the inner end m, and the square portion of the shank enters it, and prevents its turning around. y

A slot, g, is formed in the'handle for the pin f to slide in, thus preventing the said pin from interfering with the proper handlingr of the wrench.

The bolt E consists of four parts, the plain guide- Vpin f, which passes through the ferrnle e, guiding and strengthening the bolt; the roset or hand-nut h, for operating the bolt; :che right-hand threaded portion o', which works in the nut b; and the left-hand threaded port-ion k, which works in the nut at a.

Having thus fully described my invention,

l. rlhe combination, in a wrench, of the right and left-hand threaded screw-bolt E with the stationary jaw A, the shank' B, and the sliding jaw C, substanspecilied.

ANDREW B. LIPSEY.

Witnesses:

EDWARD BROWN,

H. JAMES WRsToN. 

